کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10154704 | 1666311 | 2018 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Thermal cycling durability improved by doping fluorine to PrBaCo2O5+δ as oxygen reduction reaction electrocatalyst in intermediate-temperature solid oxide fuel cells
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
الکتروشیمی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Double perovskite PrBaCo2O5+δ (PBC) has received much attention as cathode material for solid oxide fuel cells (SOFCs) due to its excellent catalytic activity for oxygen reduction reaction (ORR), especially at intermediate temperature up to 800â¯Â°C. However, its high thermal expansion coefficient (CTE), about twice as the electrolytes, usually results in poor durability. This work presents the effect of CTE reduction by doping fluorine ion to the oxygen-site of PrBaCo2O5+δ. The fluorine doping, which is confirmed with X-ray diffraction (XRD) and X-ray photoelectron spectroscopy investigations, can substantially reduce CTE, from 24.03â¯Ãâ¯10â6â¯Kâ1 down to 16.78â¯Ãâ¯10â6â¯Kâ1 as determined with dilatometry while from 26.52â¯Ãâ¯10â6â¯Kâ1 to 17.46â¯Ãâ¯10â6â¯Kâ1 with high-temperature XRD. Consequently, the durability is improved by a factor of â¼3.0 when the electrodes are subjected to 200-800â¯Â°C thermal cycles. In addition, the fluorine doping does not deteriorate but maintains or even improves the oxygen transport properties and electrochemical performance for ORR of PBC, demonstrating that fluorine doping is very attractive for the development of promising cathode materials for intermediate-temperature SOFCs.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Power Sources - Volume 402, 31 October 2018, Pages 363-372
Journal: Journal of Power Sources - Volume 402, 31 October 2018, Pages 363-372
نویسندگان
Yanhong Wan, Yulin Xing, Yihang Li, Daoming Huan, Changrong Xia,